Retroreflective material including geometric fresnel zone plates

Retroreflective material is made by recording an array of photoreduced images of an original geometric fresnel zone plate image in a photosensitive medium; using the developed photosensitive medium to make a stamper for embossing an array of phase modulated fresnel zone plates corresponding to the p...

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Bibliographic Details
Main Author STREHLOW; WOLFGANG H
Format Patent
LanguageEnglish
Published 23.11.1976
Subjects
ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTIONOF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, ORTHE LIKE
ADVERTISING
ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING ORSUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES INGENERAL
CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
CRYPTOGRAPHY
DISPLAY
DISPLAYING
EDUCATION
FIXED CONSTRUCTIONS
LABELS OR NAME-PLATES
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PERFORMING OPERATIONS
PHYSICS
SEALS
SIGNS
TRANSPORTING
VEHICLES IN GENERAL
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Summary:Retroreflective material is made by recording an array of photoreduced images of an original geometric fresnel zone plate image in a photosensitive medium; using the developed photosensitive medium to make a stamper for embossing an array of phase modulated fresnel zone plates corresponding to the photoreduced images; using the stamper to emboss such fresnel zone plates in a transparent copy medium having a thickness equal to a given focal length associated with such fresnel zone plates to provide an array of such fresnel zone plates at one surface of the copy medium; and coating a reflective material on the opposite surface of the copy medium.
Bibliography:Application Number: US19750548440